Added I2C support for raspi & first rework of debugging

include/sta/devices/raspi/gpio_pin.hpp

@@ -0,0 +1,46 @@
+#ifndef STA_CORE_RASPI_GPIO_PIN_HPP
+#define STA_CORE_RASPI_GPIO_PIN_HPP
+
+// Only enable module on Raspi platform w/ HAL GPIO module enabled
+#include <sta/config.hpp>
+#ifdef STA_PLATFORM_RASPI
+#   include <sta/devices/raspi/hal.hpp>
+#   define STA_RASPI_GPIO_ENABLED
+#endif // STA_PLATFORM_RASPI
+
+#if defined(STA_RASPI_GPIO_ENABLED) || defined(DOXYGEN)
+
+#include <sta/gpio_pin.hpp>
+#include <cstdint>
+
+namespace sta 
+{
+    enum class GpioMode {
+        GPIO_OUTPUT,
+        GPIO_INPUT
+    };
+
+    class RaspiGpioPin : public GpioPin
+    {
+    public: 
+        /**
+         * @param pin   Pin index
+         * @param mode  The mode of the GPIO pin. Either INPUT or OUTPUT
+         */
+        RaspiGpioPin(uint8_t pin, GpioMode mode);
+
+        void setState(GpioPinState state) override;
+
+        GpioPinState getState() override;
+
+        static RaspiGpioPin * DUMMY_GPIO;
+        
+    private:
+        uint8_t pin_;
+        GpioMode mode_;
+    };
+} // namespace sta
+
+#endif // STA_RASPI_GPIO_ENABLED
+
+#endif // STA_CORE_RASPI_GPIO_PIN_HPP